calhoun.analysis.crf.features.generic
Class StartFeatures

java.lang.Object
  calhoun.analysis.crf.AbstractFeatureManager<java.lang.Object>
      calhoun.analysis.crf.features.generic.StartFeatures

All Implemented Interfaces:

FeatureManager<java.lang.Object>, FeatureManagerNode<java.lang.Object>, java.io.Serializable

public class StartFeatures
extends AbstractFeatureManager<java.lang.Object>
implements FeatureManagerNode<java.lang.Object>

indicator functions that evaluate to true for a selected set of start states at the first position in the sequence.

See Also:

Serialized Form

Constructor Summary

StartFeatures()

Method Summary

void	evaluateNode(InputSequence<?> seq, int pos, int state, FeatureList result) Evaluates the set of features managed by this object for the given arguments.
java.lang.String	getFeatureName(int featureIndex) Returns a human identifiable name for the feature referenced by a given index.
int	getNumFeatures() Returns the number of features maintained by this FeatureManager.
void	setStates(int[] config)
void	train(int startingIndex, ModelManager modelInfo, java.util.List data) Start features don't train based on the data.

Methods inherited from class calhoun.analysis.crf.AbstractFeatureManager

getCacheStrategy, getInputComponent, setInputComponent

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface calhoun.analysis.crf.FeatureManager

getCacheStrategy, getInputComponent, setInputComponent

Constructor Detail

StartFeatures

public StartFeatures()

Method Detail

setStates

public void setStates(int[] config)

getFeatureName

public java.lang.String getFeatureName(int featureIndex)

Description copied from interface: FeatureManager

Returns a human identifiable name for the feature referenced by a given index. Used for display purposes only.

Specified by:

getFeatureName in interface FeatureManager<java.lang.Object>

Parameters:

featureIndex - the index of this feature

Returns:

the human readable name of this feature

getNumFeatures

public int getNumFeatures()

Description copied from interface: FeatureManager

Returns the number of features maintained by this FeatureManager. This number must be fixed after the call to trainFeatures is complete.

Specified by:

getNumFeatures in interface FeatureManager<java.lang.Object>

Returns:

number of features managed by this FeatureManager

evaluateNode

public void evaluateNode(InputSequence<?> seq,
                         int pos,
                         int state,
                         FeatureList result)

Description copied from interface: FeatureManagerNode

Evaluates the set of features managed by this object for the given arguments.

Specified by:

evaluateNode in interface FeatureManagerNode<java.lang.Object>

train

public void train(int startingIndex,
                  ModelManager modelInfo,
                  java.util.List data)

Start features don't train based on the data. Just set up based on the model.

Specified by:

train in interface FeatureManager<java.lang.Object>

Parameters:

startingIndex - the feature index of the first feature owned by this FeatureManager. Each FeatureManager must use up consecutive indexes, so the last index used will be startingIndex + numFeatures - 1.

modelInfo - the model that contains this feature

data - the full list of training sequences to use to train the feature